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/*
FFTease - A set of Live Spectral Processors
Originally written by Eric Lyon and Christopher Penrose for the Max/MSP platform
Copyright (c)Thomas Grill (xovo@gmx.net)
For information on usage and redistribution, and for a DISCLAIMER OF ALL
WARRANTIES, see the file, "license.txt," in this distribution.
*/
#include "main.h"
#include <stdlib.h>
class disarray:
public fftease
{
FLEXT_HEADER_S(disarray,fftease,setup)
public:
disarray(I argc,const t_atom *argv);
protected:
virtual V Transform(I _N2,S *const *in);
BL _qual;
I _shuffle_count,_max_bin;
F _freq;
I *_shuffle_in,*_shuffle_out;
V reset_shuffle();
private:
virtual V Set();
virtual V Clear();
virtual V Delete();
V ms_freq(F f);
static V setup(t_classid c);
FLEXT_CALLBACK(reset_shuffle)
FLEXT_ATTRGET_F(_freq)
FLEXT_CALLSET_F(ms_freq)
FLEXT_ATTRVAR_I(_shuffle_count)
};
FLEXT_LIB_DSP_V("fftease, disarray~",disarray)
V disarray::setup(t_classid c)
{
FLEXT_CADDBANG(c,0,reset_shuffle);
FLEXT_CADDATTR_VAR(c,"knee",_freq,ms_freq);
FLEXT_CADDATTR_VAR1(c,"partials",_shuffle_count);
}
disarray::disarray(I argc,const t_atom *argv):
fftease(2,F_BITSHUFFLE),
_qual(false),_shuffle_count(20),_max_bin(0),_freq(1300)
{
/* parse and set object's options given */
if(argc >= 1) {
if(CanbeFloat(argv[0]))
_freq = GetAFloat(argv[0]);
else
post("%s - Freq must be a float value - set to %0f",thisName(),_freq);
}
if(argc >= 2) {
if(CanbeBool(argv[1]))
_qual = GetABool(argv[1]);
else
post("%s - Quality must be a boolean value - set to %0i",thisName(),_qual?1:0);
}
if(argc >= 3) {
if(CanbeInt(argv[2]))
_shuffle_count = GetAInt(argv[2]);
else
post("%s - Partials must be an integer value - set to %0i",thisName(),_shuffle_count);
}
Mult(_qual?4:2);
if(_qual) _flags |= F_BALANCED;
AddInSignal("Messages and input signal");
AddOutSignal("Transformed signal");
}
V disarray::Clear()
{
_shuffle_in = _shuffle_out = NULL;
fftease::Clear();
}
V disarray::Delete()
{
fftease::Delete();
if(_shuffle_in) delete[] _shuffle_in;
if(_shuffle_out) delete[] _shuffle_out;
}
V disarray::Set()
{
fftease::Set();
const I _N2 = get_N()/2;
_shuffle_in = new I[_N2];
_shuffle_out = new I[_N2];
// calculate _max_bin
ms_freq(_freq);
}
V disarray::ms_freq(F f)
{
_freq = f; // store original
const F funda = get_Fund();
// TG: This is a different, but steady correction than in original fftease
if( f < funda ) f = funda;
else if(f > Samplerate()/2) f = Samplerate()/2;
_max_bin = (I)(f/funda+0.5);
reset_shuffle();
}
inline V swap(F &a,F &b) { F t = a; a = b; b = t; }
inline V swap(I &a,I &b) { I t = a; a = b; b = t; }
V disarray::Transform(I _N,S *const *)
{
I shcnt = _shuffle_count;
if(shcnt < 0) shcnt = 0;
else if(shcnt > _N/2) shcnt = _N/2;
for(I i = 0; i < shcnt; i++)
// leave phase, just swap amplitudes
swap(_channel1[ _shuffle_in[i] * 2 ],_channel1[ _shuffle_out[i] * 2]);
}
V disarray::reset_shuffle()
{
const I _N2 = get_N()/2;
I i;
for( i = 0; i < _N2; i++ )
_shuffle_out[i] = _shuffle_in[i] = i ;
for( i = 0; i < _max_bin*2; i++ ) {
I p1 = _shuffle_out[ rand()%_max_bin ];
I p2 = _shuffle_out[ rand()%_max_bin ];
swap(_shuffle_out[ p1 ],_shuffle_out[ p2 ]);
}
}
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